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Invisible Nurses are entities found within any level that seems to resemble a hospital. Most notably Level 114.
They are passive entities, and can be killed easily. They walk around randomly and will tend to patients that are injured. This includes injured explorers, which make them a reliable healing source.
Invisible Nurses do not have a body, and are a floating nurse hat, nurse attire and nurse shoes, they do not have any human body parts nor organs.
Ask for help when hurt.
Kill them (this is uneccessary)